This title appears in the Scientific Report :
2001
Please use the identifier:
http://hdl.handle.net/2128/10739 in citations.
Please use the identifier: http://dx.doi.org/10.1007/s100500170085 in citations.
Aspects of near-threshold neutral pion photoproduction off protons
Aspects of near-threshold neutral pion photoproduction off protons
We investigate near-threshold neutral pion photoproduction off protons to fourth order in heavy-baryon chiral perturbation theory in the light of the new data from MAMI. Ve show that the unitarity cusp at the secondary pi (+)n threshold is in agreement with expectations from the final-state theorem....
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Personal Name(s): | Bernard, V. |
---|---|
Kaiser, N. / Meissner, U.G. | |
Contributing Institute: |
Institut 3 (Theoretische Kernphysik); IKP-3 |
Published in: | The @European physical journal / A, 11 (2001) S. 209 - 216 |
Imprint: |
Berlin
Springer
2001
|
Physical Description: |
209 - 216 |
DOI: |
10.1007/s100500170085 |
Document Type: |
Journal Article |
Research Program: |
Theoretische Kernphysik |
Series Title: |
European Physical Journal A
11 |
Subject (ZB): | |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1007/s100500170085 in citations.
We investigate near-threshold neutral pion photoproduction off protons to fourth order in heavy-baryon chiral perturbation theory in the light of the new data from MAMI. Ve show that the unitarity cusp at the secondary pi (+)n threshold is in agreement with expectations from the final-state theorem. We also analyze the fourth-order corrections to the P-wave low-energy theorems and show that potentially large Delta isobar contributions axe cancelled by sizeable pion loop effects. This solidifies the parameter-free third-order predictions, which arc, in good agreement with the data. |